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440 Six Pack Upper Fuel Line Leaks #2552768
09/21/18 11:39 AM
09/21/18 11:39 AM
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Canada
Ghoste Offline OP
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Is there a recommended way to assemnble these things to prevent the fuel leaks? New lines from Fine Lines.


I see a light at the end of the tunnel, and it's... ELECTROLUMINESCENT!
Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2552770
09/21/18 11:53 AM
09/21/18 11:53 AM
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Crook County, ILL
Mastershake340 Offline
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A couple years ago when I was getting my T/A back together, I was having a terrible time with the fuel lines leaking terribly. I talked to my engine builder, and he laughed and said just put some red grease on the threads before you install and tighten the fuel line fittings. He said that works like a charm.
I couldn't imagine something that simple would work. But I tried it, and it worked like a charm, dry as a bone! thumbs

Re: 440 Six Pack Upper Fuel Line Leaks [Re: Mastershake340] #2552783
09/21/18 12:05 PM
09/21/18 12:05 PM
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Canada
Ghoste Offline OP
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Really? I would have thought the grease soluble in fuel. I'm going to try it tonight. Thanks.


I see a light at the end of the tunnel, and it's... ELECTROLUMINESCENT!
Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2552792
09/21/18 12:14 PM
09/21/18 12:14 PM
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Crook County, ILL
Mastershake340 Offline
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As he explained it, the threads on new fittings often have little burrs on them. So when you tighten the lines until snug, they sometimes aren't fully threaded into place even though you have tightened them. The grease isn't to seal, it's to lube the threads so that the line can be fully threaded into place and seals.

Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2552805
09/21/18 12:35 PM
09/21/18 12:35 PM
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Hamilton, Ontario Canada
Magnum Offline
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The lube is like Master said, for the threads. On a flared fitting the threads are only there to push on the flare on the tube to the cone on the fitting.
It could also be a bad surface on the flared end. Polish the flare on the open end. Mark it with a Sharpie and dry assemble. The ink should transfer to the cone all the way around.


69 Super Bee, 93 Mustang LX, 04 Allure Super
Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2552809
09/21/18 12:38 PM
09/21/18 12:38 PM
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Canada
Ghoste Offline OP
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Makes sense, the leaks are all at the T-blocks, not the carbs.


I see a light at the end of the tunnel, and it's... ELECTROLUMINESCENT!
Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2552859
09/21/18 02:17 PM
09/21/18 02:17 PM
Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn Offline
master
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Originally Posted By Ghoste
Is there a recommended way to assemble these things to prevent the fuel leaks? New lines from Fine Lines.



Flare the end of a piece of the correct size soft copper tubing,cut off the flare and insert into the fuel inlet fitting,no more leaks.Also,comes apart with ease and you don't have to mess up the tube nut.

Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2552892
09/21/18 03:18 PM
09/21/18 03:18 PM
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Canada
Ghoste Offline OP
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So its acting as a sort of soft metal gasket in a sense?


I see a light at the end of the tunnel, and it's... ELECTROLUMINESCENT!
Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2552900
09/21/18 03:34 PM
09/21/18 03:34 PM
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Mass
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Grease/lube the threads as mentioned, also use a tube wrench so as not the distort the flare nut tightening it, as a regular wrench will egg the flare nut, often resulting in a poor compression of the flare/nut, along with thread FUBAR and leaks

Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2552935
09/21/18 04:38 PM
09/21/18 04:38 PM
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Canada
Ghoste Offline OP
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Yes, the tubing wrench one is a biggie that a lot of people overlook.


I see a light at the end of the tunnel, and it's... ELECTROLUMINESCENT!
Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2553202
09/22/18 12:18 PM
09/22/18 12:18 PM
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Lansing, MI
70gtx440dana Offline
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Is the grease method also acceptable for flared brake line fittings?


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Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2553203
09/22/18 12:19 PM
09/22/18 12:19 PM
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north of coder
moparx Offline
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on some stainless line connections, i have had to tighten, release, and re-tighten several times to get an effective seal. grease on the threads and around the tubing helps to keep the tubing round and booger free. i don't know why stainless acts this way, unless it's the work hardening that occurs to the material during the flaring process, causes the flare to become slightly egg shaped, and the repeatedly tighten/loosen process restores the flare's roundness.
beer

Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2553204
09/22/18 12:24 PM
09/22/18 12:24 PM
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Spokane Washington
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Grease as mentioned above and by all means use a tubing wrench and a SECOND wrench to hold it while you tighten them! If you just crank on the tubing nut with one wrench you can strip the fuel inlets in the bowls or twist the lines.

Re: 440 Six Pack Upper Fuel Line Leaks [Re: 70gtx440dana] #2553205
09/22/18 12:26 PM
09/22/18 12:26 PM
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Posts: 8,340
Crook County, ILL
Mastershake340 Offline
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Originally Posted By 70gtx440dana
Is the grease method also acceptable for flared brake line fittings?

I'd be wary of using any petroleum product on brake components as it's not compatible with the seals. The trace of grease that might get in the system probably wouldn't be enough to cause problems, but I wouldn't take the chance. Maybe a little silicon brake fluid could be used as a lube on brake line threads?

Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2553260
09/22/18 03:09 PM
09/22/18 03:09 PM
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Posts: 1,163
NORTHERN VA
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OK, Just use WD40 and skip the greasy mess. You ALWAYS use a tubeing/brake line wrench and tighten and loosen several times (5-6 ) then tighten . Always use wrench to hold the blocks while you tighten the ends. I never use stainless on the six pack lines as they are a pain to seal .

Re: 440 Six Pack Upper Fuel Line Leaks [Re: THESHAKERPROJECT] #2553400
09/22/18 10:56 PM
09/22/18 10:56 PM
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glendora, ca.
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Deepockets Offline
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I've also run into this issue. There were several things that I've found with the fuel line kits not having the flares aligned straight with the male flare in the brass tee's. I now do some slight bending to get the fuel lines to align straight with the brass tee's and where the lines go to the fuel inlet on the carburetor. I also had one of the brass tee's that the male nipple was machined off center. The new steel line worked for me better than the stainless kit. Also I've noticed that the fuel inlet fitting on the carb. had a noticeable groove where the fuel line was previously seated. What I do now is replace the fuel line kit and the carburetor inlet fittings every time I have to remove them so every thing has a new mating surface as it goes together.

Last edited by Deepockets; 09/23/18 10:11 AM.
Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2553477
09/23/18 02:41 AM
09/23/18 02:41 AM
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California
BigDaddy440 Offline
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California
I had the same issue. For me the fix was using "Type 3" Prime Seal Aviation gasket sealant. It's made by Versachem. Worked like a charm the first time.


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Re: 440 Six Pack Upper Fuel Line Leaks [Re: Mastershake340] #2553506
09/23/18 05:02 AM
09/23/18 05:02 AM
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Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
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Originally Posted By Mastershake340
A couple years ago when I was getting my T/A back together, I was having a terrible time with the fuel lines leaking terribly. I talked to my engine builder, and he laughed and said just put some red grease on the threads before you install and tighten the fuel line fittings. He said that works like a charm.
I couldn't imagine something that simple would work. But I tried it, and it worked like a charm, dry as a bone! thumbs


This is the only correct way to install them. Any and all inverted and regular flare fittings need lube and are designed for sealing at the flare, so no sealant should be used.
Really tight fittings with the proper wrench like mentioned above is the way to go. Lube allows you to get them really tight.

Grease or oil only around fuel systems.(I use motor oil) Teflon sealant could easily contaminate a fuel system if used on flare fittings.


Re: 440 Six Pack Upper Fuel Line Leaks [Re: Ghoste] #2553584
09/23/18 12:34 PM
09/23/18 12:34 PM
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Posts: 3,275
West Coast, USA
jbc426 Offline
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As mentioned above, lube the threads and tighten the fittings while holding the part they are threading into.

Also, I've found most leaking fittings including brake lines need to be tightened, loosened and re-tightened about a have a dozen times to really seat them. You will notice the jam nuts threading in farther and farther each time you cycle the tightening process until they actually seat.


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Re: 440 Six Pack Upper Fuel Line Leaks [Re: jbc426] #2553725
09/23/18 05:29 PM
09/23/18 05:29 PM
Joined: Feb 2006
Posts: 604
TN
1DGEMAN Offline
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I have always used anti seize. Works like a charm. A little dab will do ya.


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